The GT\CS lettering on air intakes look wrong to me.....In addition to the front quarter badging it also has the '67 steering wheel and some additional 390 badging on trunk lid.....Hmmm indeed!
Stephen

Steering wheel is an aftermarket upgrade to a wood look that many people do. Hood paint is not a stock job but the owner must have wanted a different look. Fender emblem is not correct as we all know, but the car could still be a real GT/CS.

Time will tell or we can ask him for the VIN number and find out. As always the photos look great, but buying something site unseen scares me the death. Even if it is the real deal.